Lhcb Insists On Tension Amongst Lepton Universality Inwards \(1\)-\(6\Gev^2\)

The release of references to B-mesons on this spider web log significantly exceeds my marking of excitement well-nigh these saltation states of quarks as well as antiquarks exactly what tin I do? They are with the leaders of the revolt against the Standard Model.

LHCb: RK*0 = 0.69+0.12-0.08 inwards 1-6 GeV q^2 bin; novel 2.5 sigma difference from Standard Model adding fuel to B-meson anomalies.

— Jester (@Resonaances) April 18, 2017

Various physicists remove keep mentioned a novel announcement past times the LHCb collaboration which is smaller than ATLAS as well as CMS exactly at to the lowest degree as assertive.

Another physicist has embedded the primal graph where yous should notice that the dark crosses sit down good below the dotted describe of piece of occupation where they're predicted to sit

New final result from the @LHCbExperiment showing tantalising hints of lepton non-universality inwards rare B meson decays https://t.co/jhWnzi0IU6 pic.twitter.com/pZ15KFlFvj

— Greig Cowan (@GreigCowan) April 18, 2017

as well as nosotros were told well-nigh the LHCb PowerPoint presentation where this graph was taken from.




To brand the floor short, or as well as hence ratio describing the decays of B-mesons that should endure 1 according to the Standard Model if the electron, muon, as well as tau are as behaved – except for their differing masses which are rather irrelevant hither – ends upwardly beingness \[

\Large {\mathcal R}_{K^{*0}} = 0.69 + 0.12 - 0.08

\] peculiarly inwards the interval of momentum transfer \(q^2 \in (1,6)\GeV^2\).




There are or as well as hence like deviations at higher values of \(q^2\), it's ever well-nigh 2.2-2.5 criterion deviations below the Standard Model. Sadly, it seems that neither BaBar nor Belle saw these deficits: their hateful values are slightly greater than 1 although their mistake margin was greater than that of the LHCb collaboration. On the other hand, the deficit seems rather compatible with the LHCb's recent announcements based on a (hopefully) disjoint ready of decays.

An obvious reaction is that the difference inwards this low-energy hit isn't as good exciting, anyway, because

However, like large discrepancy inwards depression q^2 bins which is non expected from novel physics https://t.co/aVMjDodu6M

— Jester (@Resonaances) April 18, 2017

Well, unless it's or as well as hence novel physics (new fifty-fifty for Jester) that affects this unloose energy range. ;-)

I uncovering this difference rather minor as well as our survival of the 4-sigma excess at \(750\GeV\) should remove keep made us a piddling chip to a greater extent than demanding when it comes to the significance flat that is needed to brand us aroused. But those who are interested inwards the existing or potentially emerging experimental anomalies should endure aware of this difference because the contest inwards this plain is really limited.